Hard to say without knowing your full situation.
Does your power utility do net metering? How much do you expect to generate compared to your usage on a annual basis?
I got a 6.5kW system a few years ago for a final price of around 12k after rebates. It covers nearby all of my usage and my provider does net metering, so really good days cover less good days, summer covers winter, etc.
In every place I have been to that use this, they will still take order by person. Maybe I’m just lucky, though.